What are the flowers that grow on the vine of the watermelon plants?
Certified GKH Gardening Expert
If you are seeing the yellow flowers, it will start growing melons soon. Melons have male and female flowers, just like squash (https://www.gardeningknowhow.com/edible/vegetables/squash/female-male-squash-blossoms.htm). It will put out lots of male blossoms at first and will eventually put out female blossoms. If you see the female blossoms and immature fruit falling off, you may need to hand pollinate. This article will help with that: https://www.gardeningknowhow.com/edible/fruits/melons/hand-pollinating-melons.htm